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Taxes - Tax Effects of Temporary Differences and Tax Loss Carry-forwards (Detail) - SEK (kr) kr in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets | kr 24,412 | kr 22,375 |
Deferred tax liabilities | 1,295 | 3,880 |
Net balance | 23,117 | 18,495 | kr 14,610
Intangible assets and property, plant and equipment [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets | 1,447 | 1,195 |
Deferred tax liabilities | 3,457 | 7,193 |
RoU lease assets and similar assets [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets | 0 |  |
Deferred tax liabilities | 1,199 | 1,272 |
Current assets [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets | 4,340 | 3,413 |
Deferred tax liabilities | 1,323 | 1,313 |
Post employment benefits [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets | 4,778 | 5,297 |
Deferred tax liabilities | 229 | 477 |
Provisions [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets | 4,788 | 3,980 |
Deferred tax liabilities | 0 |  |
Lease liabilities and similar liabilities [membe] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets | 1,307 | 1,337 |
Deferred tax liabilities | 0 |  |
Deferred tax credits [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets | 5,027 | 5,453 |
Deferred tax liabilities | 0 |  |
Other [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets | 2,394 | 2,095 |
Deferred tax liabilities | 359 | 178 |
Loss Carry Forwards [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets | 5,603 | 6,158 |
Deferred tax liabilities | 0 |  |
Deferred tax assets/ liabilities [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets | 29,684 | 28,928 |
Deferred tax liabilities | 6,567 | 10,433 |
Net balance | 23,117 | 18,495 |
Netting of tax assets/ liabilities [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Netting of deferred tax assets | (5,272) | (6,553) |
Netting of deferred tax liabilities | kr (5,272) | kr (6,553) |

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